Psychological consequences of psychodiagnostics by MMPI computerization are considered. The comparison of computer-based and traditional forms of psychodiagnostics shows some positive new formations, enlarging its effectiveness, and some negative ones, complicating it and hindering its productive result. The correlation of positive and negative new formations is not linear and depends on concrete conditions of computerized MMPI application. The perfection of these conditions leads to optimization of computer-based MMPI usage.